The beginning date in Addendum 3 is 26-January-2017 while the date in Addendum 4 is 12-June-1999. I understand that Seraph-1 recorded events on 27-January-2017 but my understanding of addenda requires them to be entered in chronological order. Admins, is this true?

Also the SCP links in your sandbox don't reference the scp-wiki.net address. Currently they reference your sandbox's address. Might have issues if you copy code across as it is.

Would the 'cloud' surrounding the solar system in Addendum 2 reflect an amount of the sun's light? Therefore appearing as a light haze in the night sky? I assume this, as the Foundation observes thaumic tessellations as if they were projected onto the 'cloud'. Further information about the Foundation's observations of this phenomenon would clarify this point (e.g. "Of note is that Foundation telescopes have noticed patterned variations in brightness across the interior surface of the cloud. These have been identified as thaumic tessellations.")
Otherwise I'd assume the thaumic tessellations are detected due to emission of the thaumaturgic energy itself. Either way, an explanation or hypothesis from the Foundation regarding why the sunlight is not partially reflected would be useful. It is a question a researcher would ask themselves1.